Edit File: memory
// <memory> -*- C++ -*- // Copyright (C) 2001-2018 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /* * Copyright (c) 1997-1999 * Silicon Graphics Computer Systems, Inc. * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Silicon Graphics makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. * */ /** @file include/memory * This is a Standard C++ Library header. */ #ifndef _GLIBCXX_MEMORY #define _GLIBCXX_MEMORY 1 #pragma GCC system_header /** * @defgroup memory Memory * @ingroup utilities * * Components for memory allocation, deallocation, and management. */ /** * @defgroup pointer_abstractions Pointer Abstractions * @ingroup memory * * Smart pointers, etc. */ #include <bits/stl_algobase.h> #include <bits/allocator.h> #include <bits/stl_construct.h> #include <bits/stl_uninitialized.h> #include <bits/stl_tempbuf.h> #include <bits/stl_raw_storage_iter.h> #if __cplusplus >= 201103L # include <exception> // std::exception # include <typeinfo> // std::type_info in get_deleter # include <iosfwd> // std::basic_ostream # include <ext/atomicity.h> # include <ext/concurrence.h> # include <bits/functexcept.h> # include <bits/stl_function.h> // std::less # include <bits/uses_allocator.h> # include <type_traits> # include <debug/debug.h> # include <bits/unique_ptr.h> # include <bits/shared_ptr.h> # include <bits/shared_ptr_atomic.h> # if _GLIBCXX_USE_DEPRECATED # include <backward/auto_ptr.h> # endif #else # include <backward/auto_ptr.h> #endif #if __cplusplus >= 201103L # include <cstdint> # ifdef _GLIBCXX_USE_C99_STDINT_TR1 namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /** * @brief Fit aligned storage in buffer. * * [ptr.align] * * This function tries to fit @a __size bytes of storage with alignment * @a __align into the buffer @a __ptr of size @a __space bytes. If such * a buffer fits then @a __ptr is changed to point to the first byte of the * aligned storage and @a __space is reduced by the bytes used for alignment. * * @param __align A fundamental or extended alignment value. * @param __size Size of the aligned storage required. * @param __ptr Pointer to a buffer of @a __space bytes. * @param __space Size of the buffer pointed to by @a __ptr. * @return the updated pointer if the aligned storage fits, otherwise nullptr. */ inline void* align(size_t __align, size_t __size, void*& __ptr, size_t& __space) noexcept { const auto __intptr = reinterpret_cast<uintptr_t>(__ptr); const auto __aligned = (__intptr - 1u + __align) & -__align; const auto __diff = __aligned - __intptr; if ((__size + __diff) > __space) return nullptr; else { __space -= __diff; return __ptr = reinterpret_cast<void*>(__aligned); } } // 20.7.4 [util.dynamic.safety], pointer safety enum class pointer_safety { relaxed, preferred, strict }; inline void declare_reachable(void*) { } template <typename _Tp> inline _Tp* undeclare_reachable(_Tp* __p) { return __p; } inline void declare_no_pointers(char*, size_t) { } inline void undeclare_no_pointers(char*, size_t) { } inline pointer_safety get_pointer_safety() noexcept { return pointer_safety::relaxed; } _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif // _GLIBCXX_USE_C99_STDINT_TR1 #endif // C++11 #endif /* _GLIBCXX_MEMORY */
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